The positioning of the whole pawn mass. Also referred to as the pawn skeleton. This positioning of the pawns is what usually dictates the types of plans available in a given position due to open files, space, pawn weaknesses, etc.
The more-or-less fixed overall position of the pawns in an opening formation.
The position of all the pawns.
All aspects of the Pawn setup. Also referred to as the Pawn skeleton or the arrangement of a player's Pawns on the board.
Pawns being the least mobile of the pieces and the only pieces unable to move backwards, the position of the pawns influences the character of the game. The placement of the pawns is known as the pawn structure.
In chess, the pawn structure (sometimes known as the pawn skeleton) is the configuration of pawns on the chessboard. Pawns being the least mobile of the chess pieces, the pawn structure is relatively static, and largely determines the strategic nature of the position.